Diffuser, Dampers, Air Grille--- Full Range, WITH Steel frame,aluminum blade. ... and low price. Diffuser, Dampers, Air Grille with Full RangeProduct detail information Model: OB-Q-PPS-SSteel ... frame,aluminum blade.Controls the air volume from full flow to shut off.Screwdriver slot type.Only ... Fitting, etc in China. We can provide you with full range, high quality, best price, excellent service. Diffuser ...